The invention provides a preparation method of a multi-wall layer weather-resistant
plant fiber reinforced air
pipe. The preparation method comprises the following steps of mixing and emulsifying modified
plant fibers and phenolic foam materials in different proportions to obtain
surface layer and core layer
fiber foam materials, and performing paving in a laminated manner to obtain a
plant fiberreinforced foam heat-
insulation layer; sequentially paving an outer
isolation layer, the plant
fiber reinforced foam heat-
insulation layer, a damp-proof layer and a sealing layer, spraying a couplingagent among the
layers during paving, brushing vinyl resin, then paving the next layer by using a fiber-based plasticizing
adhesive, and finally obtaining the multi-wall layer weather-resistant plantfiber reinforced air
pipe; additionally arranging a mute buffer layer between the outer
isolation layer and the plant fiber reinforced foam heat-
insulation layer to increase the mute performance; or additionally arranging a
phase change layer between the plant fiber reinforced foam heat-insulation layer and the
moisture-proof layer to improve the energy-saving performance. The multi-wall layer weather-resistant plant fiber reinforced air
pipe prepared by the invention has the advantages of good heat insulation performance, light weight, good
flame-retardant performance and good anti-breaking performance.